Garmin GPS Receiver Forerunner User Manual

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Forerunner 405CX Owner’s Manual 35
Using Accessories
some 2.4 GHz wireless sensors,
which can interfere with your
heart rate monitor. Sources of
interference may include very
high voltage power lines, electric
motors, microwave ovens,
2.4 GHz cordless phones, and
wireless LAN access points.
Heart Rate Zones
CAUTION: Consult your
physician to specify heart rate
zones/targets that are appropriate
for your tness level and health
condition.
Many athletes are using heart rate
zones to measure and increase their
cardiovascular strength and improve
their level of tness. A heart rate
zone is a set range of heartbeats per
minute. The ve commonly accepted
heart rate zones are numbered from
1–5 according to increasing intensity.
The Forerunner sets the heart rate
zone ranges (see the table on page
45) based on your maximum and
resting heart rates set in your user
prole (see page 28).
You can also customize your heart
rate zones in your user prole of
Garmin Connect or Garmin Training
Center. After customizing your heart
rate zones, transfer data to your
Forerunner.
How Do Heart Rate Zones
Affect Your Fitness Goals?
Knowing your heart rate zones can
help you measure and improve
your tness by understanding and
applying these principles:
Your heart rate is a good measure
of exercise intensity.
Training in certain heart rate
zones can help you improve
cardiovascular capacity and
strength.
Knowing your heart rate
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